L-Carnitine 500 mg — 60 Capsules — Fat Transport & Cellular Energy Support*
Our L-Carnitine combines 500 mg of L-carnitine (as L-carnitine L-tartrate) in capsules to support fatty-acid transport into mitochondria, promote cellular energy production, help maintain fat metabolism, support exercise recovery markers, promote modest effects on body weight and BMI, support muscle carnitine status with carbohydrate intake, provide energy metabolism support during activity, promote reduction in exercise-induced muscle damage, support endurance and workload measures in training, promote overall metabolic wellness, and support active lifestyle energy needs* — while respecting traditional use. Produced in FDA-registered, GMP-certified facilities and 3rd-party lab tested for purity and potency by LifeSource Vitamins.
Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. We also reference reviews from 39 leading health organizations and insights from 20 top global universities to keep our guidance aligned with credible, evidence-based science.* Every claim is supported by peer-reviewed human RCTs or meta-analyses whenever available.
Clinically Studied Benefits
✓ Supports fatty-acid transport and mitochondrial energy production* — L-carnitine shuttles long-chain fatty acids into mitochondria for β-oxidation and ATP generation in metabolic reviews.*
NIH/ODS — Carnitine Fact Sheet
✓ Promotes exercise recovery and reduced muscle damage markers* — Supplementation alleviates exercise-induced muscle injury, reduces biomarkers of damage, and attenuates free radical formation in systematic reviews and meta-analyses.*
NIH/PMC — Fielding et al., 2018
✓ Supports modest reductions in body weight and BMI* — Meta-analyses show small but significant decreases in body weight, BMI, and fat mass with L-carnitine supplementation in adults.*
NIH/PubMed — Talenezhad et al., 2020
✓ Helps improve recovery from exercise-induced muscle damage* — L-carnitine reduces delayed-onset muscle soreness (DOMS) and markers of muscle damage in randomized clinical trials and meta-analyses.*
NIH/PubMed — Yarizadeh et al., 2020
✓ Promotes increased muscle carnitine content with carbohydrate coingestion* — Chronic supplementation with carbohydrates elevates skeletal muscle total carnitine, altering fuel metabolism during exercise.*
NIH/PubMed — Wall et al., 2011
✓ Supports improved physical performance and endurance in training* — Supplementation enhances body strength, sports endurance, exercise capacity, and delays fatigue in systematic reviews and meta-analyses of healthy subjects.*
NIH/PMC — Vecchio et al., 2021
✓ Promotes better exercise recovery across gender and age* — L-carnitine tartrate supplementation improves recovery and reduces fatigue following exercise in randomized double-blind trials.*
NIH/PMC — Stefan et al., 2021
✓ Supports energy metabolism during exercise* — Plays role in fatty-acid oxidation and acetyl-group buffering, contributing to cellular energy in authoritative summaries.*
NIH/ODS — Carnitine Fact Sheet
Additional / Promising Evidence
✓ May improve selected endurance and workload measures* — Evidence notes enhancements in performance indices in trained adults, varying by protocol.*
NIH/PMC — 2018 Review
✓ Contributes to small effects on fat mass in some contexts* — Analyses suggest modest body composition benefits alongside foundational lifestyle factors.*
NIH/PubMed — 2020 Meta-analysis
✓ Promotes attenuation of oxidative stress and lactate responses* — Supplementation enhances performance while reducing blood lactate and oxidative stress in resistance training.*
NIH/PMC — Koozehchian et al., 2018
✓ Supports general tolerability and safety at typical intakes* — Well tolerated in studies; consult professionals for specific conditions.*
NIH/ODS — Safety Overview
✓ May aid metabolic parameters in physical activity* — Changes in VO2, serum carnitine levels support use in rehabilitation and training programs.*
NIH/PMC — Vecchio et al., 2021
✓ Contributes to muscle damage reduction in scoping reviews* — Narrative evidence evaluates efficacy on exercise-induced damage and oxidative stress.*
NIH/PMC — Caballero-García et al., 2023
University-Led & Academic Studies
✓ Supports mitochondrial fatty-acid transport role* — Academic resources discuss carnitine in energy metabolism and exercise.*
NIH-indexed — Linus Pauling Institute/Harvard/Johns Hopkins Overviews
✓ Promotes muscle carnitine increase with carbs* — University-linked studies show chronic ingestion elevates muscle content and alters fuel use.*
NIH/PubMed — Wall et al., 2011
✓ Supports recovery in rehabilitation contexts* — Systematic academic reviews highlight benefits for physical performance and fatigue delay.*
NIH/PMC — Vecchio et al., 2021
Global Evidence & Reviews
✓ Confirms role in fat metabolism and energy* — NIH/ODS comprehensive overview details functions, sources, and research on carnitine.*
NIH/ODS — Carnitine Fact Sheet
✓ Supports exercise recovery evidence synthesis* — Reviews evaluate effects on muscle damage, oxidative stress, and performance.*
NIH/PMC — 2018 Review
✓ Aligns with meta-analyses on body composition* — Global reviews confirm modest weight/BMI/fat mass reductions in supplementation trials.*
NIH/PubMed — Talenezhad et al., 2020
We monitor research from leading institutions —
Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge, Oxford, Stanford, Yale, Tufts, University of Florida, Oregon State University – Linus Pauling Institute, Columbia, Cornell, Ohio State — to align with credible science.*
Key Ingredients
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L-Carnitine (as L-carnitine L-tartrate)* — 500 mg per capsule — Supports fatty-acid shuttling into mitochondria for energy production and exercise-related benefits.*
Brief Benefit Bullets
- 500 mg L-carnitine (as L-carnitine L-tartrate) per capsule
- Supports fat transport and cellular energy production*
- Helps active adults with training and recovery markers*
- Convenient capsule format
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3rd-party tested; Non-GMO
Suggested Use
See product label for full instructions, or as directed by a healthcare professional. Do not exceed recommended dose. If pregnant, nursing, taking medications, or have a medical condition, consult your physician.*
Product Specifications
Serving Size — 1 Capsule
Servings Per Container — 60
Amount Per Serving — L-Carnitine 500 mg (as L-carnitine L-tartrate)
Other Ingredients — Gelatin (bovine), vegetable magnesium stearate, silicon dioxide, rice flour
Form — Capsules
Quality — Third-party tested for identity, potency & purity
Storage — Store in a cool, dry place; keep out of reach of children
LifeSource Vitamins — Proudly American — Since 1992
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L-Carnitine 500 mg capsules — supports fat transport & cellular energy; exercise recovery markers; Non-GMO; 3rd-party tested. Clinically Studied Ingredients — NIH/PubMed!*
